CA1227722A - In-line check valve having combined downstream poppet support and flow control elements - Google Patents
In-line check valve having combined downstream poppet support and flow control elementsInfo
- Publication number
- CA1227722A CA1227722A CA000483690A CA483690A CA1227722A CA 1227722 A CA1227722 A CA 1227722A CA 000483690 A CA000483690 A CA 000483690A CA 483690 A CA483690 A CA 483690A CA 1227722 A CA1227722 A CA 1227722A
- Authority
- CA
- Canada
- Prior art keywords
- poppet
- flow
- valve
- seal
- seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7738—Pop valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7904—Reciprocating valves
- Y10T137/7922—Spring biased
- Y10T137/7929—Spring coaxial with valve
- Y10T137/7932—Valve stem extends through fixed spring abutment
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
IN-LINE CHECK VALVE HAVING COMBINED DOWNSTREAM
POPPET SUPPORT AND FLOW CONTROL ELEMENTS
ABSTRACT OF THE INVENTION
A poppet-type check valve (3) utilizing an inte-gral detachable flow control assembly (26) for insertion into a cooperating housing (1). The checking poppet is oriented with its' actuating stem (24), concentric guide (28), and concentric force bias spring (23) downstream of the check flow controlled orifice (15). In a pre-ferred embodiment, the flow control assembly is located internal of a housing having a first flow length (12) adjacent the controlled flow orifice and seat, and a second converging flow length (11) abutting said first flow length, and a terminating flow outlet adjacent the valve outlet port. When mounted internal of the pre-ferred housing, the valve poppet assembly lies partially within the first flow area and extends a predetermined distance into the converging section, thereby greatly reducing turbulence and having a demonstrated reduction in medium flow pressure drop over presently used units.
POPPET SUPPORT AND FLOW CONTROL ELEMENTS
ABSTRACT OF THE INVENTION
A poppet-type check valve (3) utilizing an inte-gral detachable flow control assembly (26) for insertion into a cooperating housing (1). The checking poppet is oriented with its' actuating stem (24), concentric guide (28), and concentric force bias spring (23) downstream of the check flow controlled orifice (15). In a pre-ferred embodiment, the flow control assembly is located internal of a housing having a first flow length (12) adjacent the controlled flow orifice and seat, and a second converging flow length (11) abutting said first flow length, and a terminating flow outlet adjacent the valve outlet port. When mounted internal of the pre-ferred housing, the valve poppet assembly lies partially within the first flow area and extends a predetermined distance into the converging section, thereby greatly reducing turbulence and having a demonstrated reduction in medium flow pressure drop over presently used units.
Description
~2277ZZ
IN-LINE CHECK VALVE HAVING COMBINED
DOWNSTREAM POPPET SUPPORT AND FLOW CONTROL ELEMENTS
SPECIFICATION
BACKGROUND OF THE INVENTION
This invention relates generally to in-line fluid flow check valves or back flow preventers, and more particularly concerns an improved construction which positions the closure member support downstream of the checked orifice, thereby enhancing fluid flow gape-abilities through reduced pressure drop.
In-line poppet type check valves currently in use of the type disclosed in US. Patents 2,918,083, and Z,928,416, employ poppet and/or cooperating seat constructions which during the non-check or flow condo-lion, result in highly turbulent flow regimes downstream of the flow checked orifice. As those skilled in the art will readily recognize these highly turbulent regimes result in greatly increased pressure drop through the check valve, sometimes requiring an increase in diameter in order to achieve an acceptable flow char-acteristic in a given application.
The check valve of the invention disclosed here overcomes many of the pressure drop problems of current-lye used units, and demonstrates substantially decreased pressure drop or increased flow capability. The improve-mint demonstrated by the valve of this invention is achieved through positioning the poppet closure member, poppet stem support, and closure spring downstream of the checked orifice. Applicant has discovered that proper placement of the poppet and associated support elements adjacent the downstream flow areas establishes an elementary convergent/divergent flow passage result-in in substantially reduced pressure drop in the unchecked or open positions.
~22~7722 Accordingly, it is the object of this invention to provide an in-line poppet type check valve or back flow preventer wherein pressure drop through the valve in its' unchecked or open position is substantially less than units in current use.
It is a further object of this invention to provide an in-line check valve utilizing a coaxial poppet closure member coating with a seat seal wherein the seat seal is retained during high flow conditions by an angularly oriented seal groove.
It is a further object of this invention to provide an in-line check valve of the poppet type where-in the poppet stem support acts as an anti-turbulent baffle downstream of the checked orifice.
It is an additional object of this invention to integrate into the assembled valve a secondary sealing feature by metal-to-metal contact between the insert assembly and body.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a sectional view of the check valve of the invention showing only the flow control insert assembly.
Figure 2 is a sectional view of the check valve of the invention particularly showing the flow control insert positioned within a housing of the preferred embodiment.
Figure 3 is a performance curve of the check valve of the invention in the open or unchecked post-lion, wherein pressure drop through the improved valve is compared to that of valves in current use.
3L2Z7~722 DETAILED DESCRIPTION OF THE INVENTION
Referring first to Figure 2 with occasional reference to Figure l, the disclosed improved check valve comprises insert assembly 3 positioned internal of a preferred housing 1. The insert assembly 3 incorpo-rates a flow inlet 6 in fluid communication with a flow orifice 15, having a circumferential seal 18 contained by an angularly disposed groove 22. Flow through the orifice 15 in the check position is controlled by an axially positioned poppet 19 having a poppet stem 24, and a poppet head 22. The poppet head 22 in check opera-lion cooperates with the seal 18, thereby shutting off flow through the orifice 15 in the check or non-flow direction.
The poppet stem 24 reciprocates within the con-centric poppet guide 28. The concentric guide 28 has outboard support in the form of a plurality of support vanes or flow baffles extending from the insert base to the further extension of the concentric guide. Typical-lye four vanes spaced ninety radial degrees are employed. A poppet closure spring 23 is contained inter-mediate the poppet head 22 and the opposite end of the concentric poppet guide 28.
Surrounding the poppet insert assembly portico-laxly adjacent to the downstream extension of the poppet stem 24 and support vane or baffle 28, are the body first flow length 12 and abutting second flow length if. In keeping with the invention disclosed, the down-stream portion of the poppet concentric guide 28 is post-toned so as to have a predetermined extension into or overlap 13 with the upstream portion of the converging or second flow length 11.
In non-check or flow operation, fluid entering the inlet 6, upon exceeding the pressure required to ~227~2Z
overcome the preset bias of poppet spring 23 due to force exerted on the upstream face of the poppet 19, lifts the poppet head 22 from its' sealing cooperation with seal 18 as positioned within angularly disposed or the oblique groove 22. Lift off of the poppet head 22 from sealing engagement with seal 18 allows fluid flow through the orifice 15, along the direction of arrows 29 and into a relief flow passage generally shown as 16, in the direction of arrow 30. Applicant has discovered that the presence of the flow baffles 28, poppet stem 24, and bias spring 23, inhibit the information of turbo-lent vortices 31 in the portions 11 and 12 of passage 16, resulting in substantially reduced pressure drop during flow conditions. Further, during non-check or flow conditions, the combination of first flow length or portion 12, and second flow length or portion 11, cooper-ate with the aforementioned support vanes 28 to stab-fish an elementary convergent/divergent nozzle.
In either flaw or check operation, containment of the valve internal fluid is greatly enhanced through the use of primary and secondary seals. As shown, a primary radial seal 32 is contained in a peripheral groove 34 located on the inlet adapter 5, intermediate first and second threaded portions, i.e. 39 and 40, respectively. Contained in the groove 34 is a static seal 32. The groove 34 has at its inlet end, a shoulder 35, abutting and terminating the internal end of the threaded section 39. As shown, in its assembled post-lion the inlet adapter 5 is in interference abutment with kindly section 38 of the housing 1. The sealing combination of peripheral seal 32 and cooperating surf en 32 and 35 essentially eliminate any possibility of non-containment of valve internal fluid via leakage from pressurized fluids internal of the housing 1 upstream of ~2Z772;;~
the orifice 15, when the poppet 22 is operating in its check position (reference Figure 2).
As it is apparent that there has been provided in accordance with the invention an In-Line Check Valve Having Combined Downstream Poppet Support and Flow Control Elements, that fully supplies the objects, aims and advantages set forth above. While the improved In-Line Check Valve has been described as a separate flow control and check element, and said flow control element in combination with a preferred convergent/diver-gent housing, it is evident that many alternatives, mod-fixations, and variations will be apparent to those skilled in the art as a consequence of their comprehend soon of the foregoing description. Accordingly, it is intended that the invention as disclosed and claimed shall embrace all such alternatives, modifications, and variations as fall within the spirit and broad scope of the appended claims.
IN-LINE CHECK VALVE HAVING COMBINED
DOWNSTREAM POPPET SUPPORT AND FLOW CONTROL ELEMENTS
SPECIFICATION
BACKGROUND OF THE INVENTION
This invention relates generally to in-line fluid flow check valves or back flow preventers, and more particularly concerns an improved construction which positions the closure member support downstream of the checked orifice, thereby enhancing fluid flow gape-abilities through reduced pressure drop.
In-line poppet type check valves currently in use of the type disclosed in US. Patents 2,918,083, and Z,928,416, employ poppet and/or cooperating seat constructions which during the non-check or flow condo-lion, result in highly turbulent flow regimes downstream of the flow checked orifice. As those skilled in the art will readily recognize these highly turbulent regimes result in greatly increased pressure drop through the check valve, sometimes requiring an increase in diameter in order to achieve an acceptable flow char-acteristic in a given application.
The check valve of the invention disclosed here overcomes many of the pressure drop problems of current-lye used units, and demonstrates substantially decreased pressure drop or increased flow capability. The improve-mint demonstrated by the valve of this invention is achieved through positioning the poppet closure member, poppet stem support, and closure spring downstream of the checked orifice. Applicant has discovered that proper placement of the poppet and associated support elements adjacent the downstream flow areas establishes an elementary convergent/divergent flow passage result-in in substantially reduced pressure drop in the unchecked or open positions.
~22~7722 Accordingly, it is the object of this invention to provide an in-line poppet type check valve or back flow preventer wherein pressure drop through the valve in its' unchecked or open position is substantially less than units in current use.
It is a further object of this invention to provide an in-line check valve utilizing a coaxial poppet closure member coating with a seat seal wherein the seat seal is retained during high flow conditions by an angularly oriented seal groove.
It is a further object of this invention to provide an in-line check valve of the poppet type where-in the poppet stem support acts as an anti-turbulent baffle downstream of the checked orifice.
It is an additional object of this invention to integrate into the assembled valve a secondary sealing feature by metal-to-metal contact between the insert assembly and body.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a sectional view of the check valve of the invention showing only the flow control insert assembly.
Figure 2 is a sectional view of the check valve of the invention particularly showing the flow control insert positioned within a housing of the preferred embodiment.
Figure 3 is a performance curve of the check valve of the invention in the open or unchecked post-lion, wherein pressure drop through the improved valve is compared to that of valves in current use.
3L2Z7~722 DETAILED DESCRIPTION OF THE INVENTION
Referring first to Figure 2 with occasional reference to Figure l, the disclosed improved check valve comprises insert assembly 3 positioned internal of a preferred housing 1. The insert assembly 3 incorpo-rates a flow inlet 6 in fluid communication with a flow orifice 15, having a circumferential seal 18 contained by an angularly disposed groove 22. Flow through the orifice 15 in the check position is controlled by an axially positioned poppet 19 having a poppet stem 24, and a poppet head 22. The poppet head 22 in check opera-lion cooperates with the seal 18, thereby shutting off flow through the orifice 15 in the check or non-flow direction.
The poppet stem 24 reciprocates within the con-centric poppet guide 28. The concentric guide 28 has outboard support in the form of a plurality of support vanes or flow baffles extending from the insert base to the further extension of the concentric guide. Typical-lye four vanes spaced ninety radial degrees are employed. A poppet closure spring 23 is contained inter-mediate the poppet head 22 and the opposite end of the concentric poppet guide 28.
Surrounding the poppet insert assembly portico-laxly adjacent to the downstream extension of the poppet stem 24 and support vane or baffle 28, are the body first flow length 12 and abutting second flow length if. In keeping with the invention disclosed, the down-stream portion of the poppet concentric guide 28 is post-toned so as to have a predetermined extension into or overlap 13 with the upstream portion of the converging or second flow length 11.
In non-check or flow operation, fluid entering the inlet 6, upon exceeding the pressure required to ~227~2Z
overcome the preset bias of poppet spring 23 due to force exerted on the upstream face of the poppet 19, lifts the poppet head 22 from its' sealing cooperation with seal 18 as positioned within angularly disposed or the oblique groove 22. Lift off of the poppet head 22 from sealing engagement with seal 18 allows fluid flow through the orifice 15, along the direction of arrows 29 and into a relief flow passage generally shown as 16, in the direction of arrow 30. Applicant has discovered that the presence of the flow baffles 28, poppet stem 24, and bias spring 23, inhibit the information of turbo-lent vortices 31 in the portions 11 and 12 of passage 16, resulting in substantially reduced pressure drop during flow conditions. Further, during non-check or flow conditions, the combination of first flow length or portion 12, and second flow length or portion 11, cooper-ate with the aforementioned support vanes 28 to stab-fish an elementary convergent/divergent nozzle.
In either flaw or check operation, containment of the valve internal fluid is greatly enhanced through the use of primary and secondary seals. As shown, a primary radial seal 32 is contained in a peripheral groove 34 located on the inlet adapter 5, intermediate first and second threaded portions, i.e. 39 and 40, respectively. Contained in the groove 34 is a static seal 32. The groove 34 has at its inlet end, a shoulder 35, abutting and terminating the internal end of the threaded section 39. As shown, in its assembled post-lion the inlet adapter 5 is in interference abutment with kindly section 38 of the housing 1. The sealing combination of peripheral seal 32 and cooperating surf en 32 and 35 essentially eliminate any possibility of non-containment of valve internal fluid via leakage from pressurized fluids internal of the housing 1 upstream of ~2Z772;;~
the orifice 15, when the poppet 22 is operating in its check position (reference Figure 2).
As it is apparent that there has been provided in accordance with the invention an In-Line Check Valve Having Combined Downstream Poppet Support and Flow Control Elements, that fully supplies the objects, aims and advantages set forth above. While the improved In-Line Check Valve has been described as a separate flow control and check element, and said flow control element in combination with a preferred convergent/diver-gent housing, it is evident that many alternatives, mod-fixations, and variations will be apparent to those skilled in the art as a consequence of their comprehend soon of the foregoing description. Accordingly, it is intended that the invention as disclosed and claimed shall embrace all such alternatives, modifications, and variations as fall within the spirit and broad scope of the appended claims.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In an in-line check valve of the type employing an internal seat, and reciprocating spring biased poppet for preventing reverse flow through said seat, and allowing predetermined forward flow, the improvement comprising:
an in-line housing having an internal concen-tric orifice;
a seat surrounding said orifice;
a seat seal circumferentially surrounding and partially embedded in said seat;
an axially aligned poppet having a seal face cooperating with said seat seal in preventing flow there-through;
a stem on said poppet extending downstream from said seal face;
a poppet support downstream said orifice, defin-ing a poppet guide;
means mounting said poppet stem internal said guide for reciprocating motion therein;
means mounting said poppet support in said hous-ing thereby defining a relief flow passage and fluid containment chamber for poppet flow and check positions, respectively;
first and second flow lengths in said passage;
a compression spring concentric said poppet guide and intermediate said seal face and guide;
means on said guide and poppet initially com-pressing said spring and establishing a predetermined poppet/seal force;
wherein upstream pressure on said poppet seal face in excess of a predetermined value, on overcoming said poppet spring bias, translate said poppet down-stream, thereby disengaging said poppet and seal, estab-lishing flow through said passage and around said poppet stem guides.
an in-line housing having an internal concen-tric orifice;
a seat surrounding said orifice;
a seat seal circumferentially surrounding and partially embedded in said seat;
an axially aligned poppet having a seal face cooperating with said seat seal in preventing flow there-through;
a stem on said poppet extending downstream from said seal face;
a poppet support downstream said orifice, defin-ing a poppet guide;
means mounting said poppet stem internal said guide for reciprocating motion therein;
means mounting said poppet support in said hous-ing thereby defining a relief flow passage and fluid containment chamber for poppet flow and check positions, respectively;
first and second flow lengths in said passage;
a compression spring concentric said poppet guide and intermediate said seal face and guide;
means on said guide and poppet initially com-pressing said spring and establishing a predetermined poppet/seal force;
wherein upstream pressure on said poppet seal face in excess of a predetermined value, on overcoming said poppet spring bias, translate said poppet down-stream, thereby disengaging said poppet and seal, estab-lishing flow through said passage and around said poppet stem guides.
2. The valve of claim 1 wherein said poppet support extends through said first flow length and par-tidally into said second flow length.
3. The valve of claim 2, wherein said first flow length is essentially cylindrical and said second flow length is a truncated conoid.
4. The valve of claim 1 wherein said poppet support mounting means includes primary and secondary fluid containment seals.
5. The valve of claim 4 wherein said primary and secondary seals are a resilient "O"-ring and said secondary seal is achieved by metal-to-metal contact.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US631,594 | 1984-07-17 | ||
| US06/631,594 US4537384A (en) | 1984-07-17 | 1984-07-17 | In-line check valve having combined downstream poppet support and flow control elements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1227722A true CA1227722A (en) | 1987-10-06 |
Family
ID=24531895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000483690A Expired CA1227722A (en) | 1984-07-17 | 1985-06-11 | In-line check valve having combined downstream poppet support and flow control elements |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4537384A (en) |
| EP (1) | EP0187769B1 (en) |
| JP (1) | JPS61502695A (en) |
| BR (1) | BR8506832A (en) |
| CA (1) | CA1227722A (en) |
| DE (1) | DE3582876D1 (en) |
| IL (1) | IL75556A0 (en) |
| WO (1) | WO1986000681A1 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10247839A1 (en) * | 2002-10-14 | 2004-04-22 | Stein, Günter | Check valve for flowable media |
| GB2202308B (en) * | 1987-03-20 | 1991-03-06 | Gsa Ind | Pressure control valves |
| US4979721A (en) * | 1989-12-01 | 1990-12-25 | Bridge Products, Inc. | Check valve having combined quick disconnect wrench flat defining ridge |
| US5113900A (en) * | 1991-01-30 | 1992-05-19 | Bridge Products, Inc. | Check valve with quick lock attachment feature |
| GB2253263B (en) * | 1991-03-01 | 1994-06-15 | Linemann Halflo Ltd | Non-return valve assembly |
| US5271317A (en) * | 1993-03-05 | 1993-12-21 | Aguerrevere Maria S R | Potato slicer device |
| US5450875A (en) * | 1993-07-28 | 1995-09-19 | White Industries, Llc | For a refrigerant service line coupling device |
| US5421306A (en) * | 1994-03-07 | 1995-06-06 | Walbro Corporation | Check valve for engine fuel delivery systems |
| SE521934C2 (en) * | 2000-04-14 | 2003-12-23 | Sandvik Ab | Drill bit and check valve for a drill bit |
| DE10201626A1 (en) * | 2002-01-16 | 2003-07-31 | Wildfang Dieter Gmbh | check valve |
| EP1382899A1 (en) * | 2002-07-18 | 2004-01-21 | Soda-Club (CO 2) SA | A valve for closing a container, container and a system and method for filling a container |
| US7328700B2 (en) | 2003-03-07 | 2008-02-12 | 3M Innovative Properties | Respiratory system and method of use |
| US7721756B2 (en) | 2007-03-02 | 2010-05-25 | Paul Hedding | One-piece spring and poppet incorporated into a valve seat assembly and associated method for manufacturing a one-piece spring and poppet |
| USD728072S1 (en) * | 2013-12-23 | 2015-04-28 | FNA IP Holdings, Inc | Valve |
| US9885422B2 (en) * | 2015-12-15 | 2018-02-06 | International Valve Corporation | Check valve having a friction free replaceable valve insert check assembly |
| US10125874B2 (en) | 2016-10-24 | 2018-11-13 | Flowserve Management Company | Valves including multiple seats and related assemblies and methods |
| MX2023001581A (en) * | 2018-06-07 | 2023-03-08 | The Bentley Group Ltd | Flow control valve. |
| SG10202011336XA (en) * | 2019-12-18 | 2021-07-29 | Carrier Corp | Charging port coupler |
| US12000493B2 (en) | 2021-11-17 | 2024-06-04 | Swagelok Company | Check valve |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2722232A (en) * | 1951-08-17 | 1955-11-01 | Hoffman Specialty Mfg Corp | Check valve |
| US2745628A (en) * | 1952-11-17 | 1956-05-15 | Oscar F Carlson | Valve |
| US2918083A (en) * | 1954-06-07 | 1959-12-22 | James Pond Clark | Check valve and cage construction |
| US2943639A (en) * | 1956-08-09 | 1960-07-05 | George L Smith | Readily assembled check valve |
| US2928416A (en) * | 1957-05-29 | 1960-03-15 | Walworth Co | Swing check valve |
| US2942617A (en) * | 1958-05-02 | 1960-06-28 | Gilliam James Paul | Slip check valve |
| US3199532A (en) * | 1962-12-26 | 1965-08-10 | Webster Electric Co Inc | Velocity compensated poppet valve |
| US3329154A (en) * | 1963-03-26 | 1967-07-04 | Bendix Westinghouse Automotive | Compressor control valve |
| US3373764A (en) * | 1966-02-17 | 1968-03-19 | Specialties Dev Corp | High flow relief valves |
| US3688794A (en) * | 1970-08-10 | 1972-09-05 | Bird F M | Exhalation valve for respirator |
| US3995658A (en) * | 1974-06-12 | 1976-12-07 | Societe Des Clapets T.J., Socla | Non-return valve |
| JPS5385217A (en) * | 1977-01-06 | 1978-07-27 | Toyota Motor Corp | Controller for secondary air of internal combustion engine |
-
1984
- 1984-07-17 US US06/631,594 patent/US4537384A/en not_active Expired - Fee Related
-
1985
- 1985-06-11 DE DE8585902929T patent/DE3582876D1/en not_active Expired - Fee Related
- 1985-06-11 EP EP85902929A patent/EP0187769B1/en not_active Expired - Lifetime
- 1985-06-11 CA CA000483690A patent/CA1227722A/en not_active Expired
- 1985-06-11 BR BR8506832A patent/BR8506832A/en unknown
- 1985-06-11 JP JP60502590A patent/JPS61502695A/en active Pending
- 1985-06-11 WO PCT/US1985/001086 patent/WO1986000681A1/en active IP Right Grant
- 1985-06-19 IL IL75556A patent/IL75556A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0187769A4 (en) | 1988-10-27 |
| EP0187769A1 (en) | 1986-07-23 |
| BR8506832A (en) | 1986-11-25 |
| WO1986000681A1 (en) | 1986-01-30 |
| JPS61502695A (en) | 1986-11-20 |
| EP0187769B1 (en) | 1991-05-15 |
| US4537384A (en) | 1985-08-27 |
| DE3582876D1 (en) | 1991-06-20 |
| IL75556A0 (en) | 1985-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |